Implement server-suggested update check backoff

chrome/browser/android/webapk/webapk_installer_unittest.cc

Index: chrome/browser/android/webapk/webapk_installer_unittest.cc
diff --git a/chrome/browser/android/webapk/webapk_installer_unittest.cc b/chrome/browser/android/webapk/webapk_installer_unittest.cc
index 96a82320ddcfa879b3329bac06d7b79aa2cf4b52..5460e568bf36872b6a96b095d0ade39c6030008f 100644
--- a/chrome/browser/android/webapk/webapk_installer_unittest.cc
+++ b/chrome/browser/android/webapk/webapk_installer_unittest.cc
@@ -163,7 +163,9 @@ class WebApkInstallerRunner {
   bool success() { return success_; }
 
  private:
-  void OnCompleted(bool success, const std::string& webapk_package) {
+  void OnCompleted(bool success,
+                   const std::string& webapk_package,
+                   bool less_updates) {
     success_ = success;
     on_completed_callback_.Run();
   }